Conodont biostratigraphic control on transitional marine to non-marine Permian-Triassic boundary sequences in Yunnan-Guizhou, China
Date
2007
Authors
Metcalfe, Ian
Nicoll, Robert
Journal Title
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Publisher
Elsevier
Abstract
The recovery of conodonts associated with ash beds and magnetostratigraphy in the key Zhongzhai Section, near Langdai, Liuzhi, Guizhou Province, provides precise and definitive control on the position of the Permian-Triassic boundary in the transition from marine to non-marine facies of western Guizhou and eastern Yunnan Provinces of southwestern China. In the Zhongzhai Section the boundary interval consists of a lower limestone, 20 cm thick, that contains fragments of Hindeodus sp. and Clarkina sp. This is overlain by a 50 cm thick black shale bed containing an abundant brachiopod fauna, but only a single conodont fragment. This bed is in turn overlain by a 23 cm thick limestone that contains Clarkina meishanensis, Merrillina ultima, Hindeodus changxingensis, H. praeparvus and H. eurypyge. Directly over this limestone is a 5 cm thick ash bed followed by a 10 cm thick black shale, which is overlain by a second, upper, ash bed that is 3 cm thick. On top of the upper ash bed is a 20 cm thick silty limestone containing an abundant dwarf conodont fauna, dominated by Hindeodus, and containing H. parvus but also including Clarkina tulongensis. The Permian-Triassic boundary is placed at the level of the black shale located between the two ash beds.
Description
Keywords
Keywords: biostratigraphy; black shale; conodont; facies analysis; limestone; marine record; Permian-Triassic boundary; sequence boundary; Asia; China; Eurasia; Far East; Yunnan-Guizhou Plateau; Clarkina; Hindeodus; Hindeodus parvus; Hindeodus praeparvus Conodonts; Marine to non-marine transition; Permian-Triassic boundary; Yunnan-Guizhou, China
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Source
Palaeogeography, Palaeoclimatology, Palaeoecology
Type
Journal article
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DOI
10.1016/j.palaeo.2006.11.034
Restricted until
2037-12-31